Cofiring characteristics of coal blended with torrefied Miscanthus biochar optimized with three Taguchi indexes

Huang, Chao; Li, Yueh Heng; Xiao, Kai; Lasek, Janusz

doi:10.1016/j.energy.2019.01.168

Cited by 45 publications

(15 citation statements)

References 39 publications

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“…As shown in Table 1, a great deal of research carried out tests on combustion of coal, biomass, and sludges under different atmosphere conditions. Air is the most pervasive combustion atmosphere, but gas mixtures (O 2 /CO 2 [6], O 2 /N 2 [7,8]) and nitrogen [9][10][11][12][13] as inert gas are frequently used as well. Additionally, different heating rates were investigated in the range from 2.5 • C/min to 80 • C/min.…”

Section: Introductionmentioning

confidence: 99%

Thermogravimetric Analysis of Solid Biofuels with Additive under Air Atmosphere

2021

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The paper presents the combustion profile of selected fuels as a result of thermogravimetric analysis. The main purpose of this study was to investigate a mixture of different types of fuel and the influence of the use of a fuel additive on the combustion process profile. As a fuel additive, halloysite was used to investigate the thermogravimetric profiles. It was confirmed that the main combustion parameters such as ignition temperature, burnout temperature, and maximum peak temperature correlated accordingly with different combustibility indices such as the ignition index, the burnout index, and the combustion indices. Furthermore, the present study provided a comparison of selected methods for analyzing non-isothermal solid-state kinetic data and investigated the kinetics of thermal decomposition to describe the ongoing process. Two non-isothermal model methods (Kissinger and Ozawa) were used to calculate the Arrhenius parameters. The effect of heating rate and the addition of halloysite as a fuel additive on decomposition were studied.

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Section: Introductionmentioning

confidence: 99%

Thermogravimetric Analysis of Solid Biofuels with Additive under Air Atmosphere

2021

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“…Many countries signed the Paris Agreement at the UN Climate Change Conference in 2015 with the aim of reducing GHG emissions. Consequently, these countries are developing alternative and renewable energy sources for fossil fuel replacement [1]. Biomass continues to grow in importance worldwide as a renewable and CO 2 -neutral energy source that may help to diversify renewable energy sources for energy production [2].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Ash Deposit Behavior during Co-Combustion of Bituminous Coal with Wood Pellets and Empty Fruit Bunches

Jeong

Kim

et al. 2019

Energies

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In Korea, oil-palm empty fruit bunches (EFBs), which are byproducts of the crude palm-oil milling process, are among the most promising potential energy sources for power plants. However, the slagging and fouling characteristics of EFBs during combustion have not yet been fully studied. Accordingly, in this study, we investigated the fundamental ash behavior of EFBs in comparison to that of wood pellets (WPs) using a thermomechanical analyzer (TMA) and a drop-tube furnace (DTF). Ash melting and the deposition of ash particles were investigated with traditional prediction indices at several biomass blending ratios. The results demonstrated that, as the ratio of WPs to EFBs increases, the melting temperature decreases and the slagging propensity increases because of the increased biomass alkali content. Moreover, the penetration derived using the TMA shows a higher melting peak at which rapid melting occurs, and the melting temperature distribution is decreased with increased biomass blending. Conversely, the DTF results show different phenomena for ash deposition under the same blending conditions. Blend ratios approaching 10% WP and 15% EFB result in gradual decreases in ash deposition tendencies because of the lower ash contents of the co-combusted mass compared to that of the single coal ash. Further biomass addition increases ash deposition, which is attributable to ash agglomeration from the biomass. Thus, this study demonstrates that blending ratios of 10% WP and 15% EFB provide optimal conditions for co-combustion with the selected bituminous coal. In addition, it is shown that the slagging propensity of EFB is higher than that of WP owing to its ash content and simultaneous agglomeration.

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“…Table 1 lists the properties of wood pellets from Alee‐tree waste, which is a hardwood (typical lignin percentages vary from 16 to 25%), 26 and the caloric value is approximately 74% that of conventional coal (6253 cal/g) 20 . According to the wood transformation process, ancient plants regularly take long periods to undergo dehydration and deoxygenation processes at high temperatures and high‐pressure surroundings underground, and they gradually form coal.…”

Section: Resultsmentioning

confidence: 99%

“…Consequently, several studies have used laboratory‐scale systems with high‐temperature surroundings (heating rate as high as 10 4 K/s), such as a drop‐tube furnace 15,16 or hot‐flow reactor 17,18 to investigate the combustion process and bridge this knowledge gap. Bi et al 19 observed that hetero‐homogeneous ignition of a single peanut shell pellet occurred when the oxygen concentration exceeded 50% in O 2 /CO 2 surroundings at flow temperatures greater than 873 K. Huan et al 20 reported that 50% of miscanthus biochar blended with coal pellet enhanced fuel reactivity and shortened the total combustion time at 600°C. Peng et al 21 measured the combustion kinetic of wood using a TG analysis (TGA) and a tubular furnace.…”

Section: Introductionmentioning

confidence: 99%

Thermochemical conversion characteristics of a single wood pellet in a convective low‐temperature air environment

2020

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Summary In this study, the thermochemical conversion process of a single wood pellet under low temperature (350°C‐650°C) isothermal heating is investigated to identify the outstanding low‐temperature ignition and combustion characteristics for heat generation, particularly during the preheating stages in the furnace. The thermal behavior of wood powder was analyzed using thermogravimetric/Fourier transform infrared spectroscopy. The suspended single pellet combustion phenomenon under a convective hot air stream was also explored. The results showed that the wood primarily decomposed in a range from 240°C to 520°C, and low‐temperature ignition was found at 293°C due to heterogeneous oxidation. For pellet combustion, an outstanding heterogeneous‐induced homogeneous combustion phenomenon occurred when the stream temperature was higher than 350°C. In contrast, the ignition mechanism shifted to volatile auto‐ignite mode at 650°C due to the interplay of fuel devolatilization and oxygen diffusion. The pellet temperature evolution was measured, and the results revealed a maximum heating rate of 6.61‐16.95 K/s under a stream temperature ranging from 350°C to 650°C. The weight loss evolution showed three stages during the entire heating process, and the average activation energy (13.12 kJ/mol) was obtained. Char combustion was found favorable to CO production for gaseous emissions, but the burning of volatiles tended to convert fuel into CO2. Finally, a simplified reaction scheme based on different onset temperatures, including pyrolysis, heterogeneous/homogeneous oxidation, and heterogeneous gasification was proposed to illustrate a potential thermochemical conversion route for further utilization.

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Cofiring characteristics of coal blended with torrefied Miscanthus biochar optimized with three Taguchi indexes

Cited by 45 publications

References 39 publications

Thermogravimetric Analysis of Solid Biofuels with Additive under Air Atmosphere

Thermogravimetric Analysis of Solid Biofuels with Additive under Air Atmosphere

Experimental Investigation of Ash Deposit Behavior during Co-Combustion of Bituminous Coal with Wood Pellets and Empty Fruit Bunches

Thermochemical conversion characteristics of a single wood pellet in a convective low‐temperature air environment

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